MacBook Pro Black Screen

I tried turning on my MacBook Pro 13” (Model: A2159). However, every time I try turning it on the Apple logo comes out and then a black screen just appears with the sound of the computer turning on and off. I have tried to reset and reinstall the macOS but wouldn’t do any change. The keyboard is functioning, but the computer screen doesn't go pass the Apple logo just to a black screen that turns on and off. I have seen the inside of the computer and I’m thinking it might be the battery as there seems to be some weird marking on one side; however, I’m not so sure. Plz let me know, I’ve tried taking it to Bestbuy for a repair but they couldn’t find a solution. Thank you